linux-kernel - Re: [PATCH 10/15] acpi: Ignore acpi_rsdp kernel parameter in a secure boot environment

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Date:	Sun, 17 Feb 2013 17:00:23 +0800
From:	Dave Young <hidave.darkstar@...il.com>
To:	Matthew Garrett <matthew.garrett@...ula.com>
Cc:	linux-kernel@...r.kernel.org, linux-efi@...r.kernel.org,
	linux-security-module@...r.kernel.org,
	Josh Boyer <jwboyer@...hat.com>, lxiang@...hat.com,
	Vivek Goyal <vgoyal@...hat.com>
Subject: Re: [PATCH 10/15] acpi: Ignore acpi_rsdp kernel parameter in a secure
 boot environment

On Tue, Jan 29, 2013 at 12:42 AM, Matthew Garrett
<matthew.garrett@...ula.com> wrote:
> From: Josh Boyer <jwboyer@...hat.com>
>
> This option allows userspace to pass the RSDP address to the kernel.  This
> could potentially be used to circumvent the secure boot trust model.
> We ignore the setting if we don't have the CAP_COMPROMISE_KERNEL capability.
>
> Signed-off-by: Josh Boyer <jwboyer@...hat.com>
> ---
>  drivers/acpi/osl.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c
> index bd22f86..88251d2 100644
> --- a/drivers/acpi/osl.c
> +++ b/drivers/acpi/osl.c
> @@ -246,7 +246,7 @@ early_param("acpi_rsdp", setup_acpi_rsdp);
>  acpi_physical_address __init acpi_os_get_root_pointer(void)
>  {
>  #ifdef CONFIG_KEXEC
> -       if (acpi_rsdp)
> +       if (acpi_rsdp && capable(CAP_COMPROMISE_KERNEL))


This caused an issue in a kdump test even without secure boot enabled.
Looks like security subsystem init is not initialized yet at this
point.

See redhat bug 906225:
https://bugzilla.redhat.com/show_bug.cgi?id=906225


>                 return acpi_rsdp;
>  #endif
>
> --
> 1.8.0.2
>
> --
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-- 
Regards
Dave
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